CVE-2021-3048— PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage
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I. Basic Information for CVE-2021-3048
Vulnerability Information
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Vulnerability Title
PAN-OS: Invalid URLs in an External Dynamic List (EDL) can Lead to Firewall Outage
Source: NVD (National Vulnerability Database)
Vulnerability Description
Certain invalid URL entries contained in an External Dynamic List (EDL) cause the Device Server daemon (devsrvr) to stop responding. This condition causes subsequent commits on the firewall to fail and prevents administrators from performing commits and configuration changes even though the firewall remains otherwise functional. If the firewall then restarts, it results in a denial-of-service (DoS) condition and the firewall stops processing traffic. This issue impacts: PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.9; PAN-OS 10.0 versions earlier than PAN-OS 10.0.5. PAN-OS 8.1 and PAN-OS 10.1 versions are not impacted.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Palo Alto Networks PAN-OS 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Palo Alto Networks PAN-OS是美国Palo Alto Networks公司的一套为其防火墙设备开发的操作系统。 Palo Alto Networks PAN-OS 存在安全漏洞，该漏洞源于外部动态列表 (EDL) 中包含的某些无效 URL 条目会导致设备服务器守护程序 (devsrvr) 停止响应。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Palo Alto Networks | PAN-OS | 10.1.* | - |
II. Public POCs for CVE-2021-3048
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://security.paloaltonetworks.com/CVE-2020-3048x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-3048
Same Patch Batch · Palo Alto Networks · 2021-08-11 · 5 CVEs total
| CVE-2021-3050 | 8.8 HIGH | PAN-OS: OS Command Injection Vulnerability in Web Interface |
| CVE-2021-3046 | 6.8 MEDIUM | PAN-OS: Improper SAML Authentication Vulnerability in GlobalProtect Portal |
| CVE-2021-3045 | 4.9 MEDIUM | PAN-OS: OS Command Argument Injection in Web Interface |
| CVE-2021-3047 | 4.2 MEDIUM | PAN-OS: Weak Cryptography Used in Web Interface Authentication |
IV. Related Vulnerabilities
Same product: PAN-OS
- CVE-2025-0116
PAN-OS: Firewall Denial of Service (DoS) Using a Specially C - CVE-2025-0115
PAN-OS: Authenticated Admin File Read Vulnerability in PAN-O - CVE-2025-0114
PAN-OS: Denial of Service (DoS) in GlobalProtect - CVE-2024-9471
PAN-OS: Privilege Escalation (PE) Vulnerability in XML API - CVE-2024-8691
PAN-OS: User Impersonation in GlobalProtect Portal
Same vendor: Palo Alto Networks
- CVE-2026-0300
PAN-OS: Unauthenticated user initiated Buffer Overflow Vulne - CVE-2026-0232
Cortex XDR Agent: Local Administrator can disable the agent - CVE-2026-0233
Autonomous Digital Experience Manager: Improper validation o - CVE-2026-0234
Cortex XSOAR: Improper Verification of Cryptographic Signatu - CVE-2026-0231
Cortex XDR Broker VM: Sensitive Information Disclosure Vulne
Same weakness: CWE-20
V. Comments for CVE-2021-3048
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